~JB - Reset Battery Dead

Overview

The ~JB command resets the battery dead condition for Battery Powered Font Cards. This command must be sent after replacing a failed battery to restore card functionality, or can be used to intentionally clear/reinitialize a card.

Syntax

~JB

Parameters

None

Description

• Resets battery dead indicator
• Restores battery-backed memory functionality
• Must be sent after battery replacement
• Allows card reinitialization

When to Use

Battery Replacement

When battery fails:

1. Battery Powered Font Card shows "battery dead" on configuration label (~WC)
2. Replace the battery
3. Send ~JB command
4. Card becomes functional again

Card Reinitialization

• Intentionally clear/reinitialize card
• Card must not be write-protected
• Removes all stored fonts and data

Important Notes

⚠️ CRITICAL: Without ~JB after battery replacement:

• Card will NOT function
• Printer cannot use stored fonts
• Card status shows "battery dead"
• Must send ~JB to restore operation

Examples

After Battery Replacement

~JB

Resets battery condition after battery replacement.

Full Recovery Process

1. Power off printer
2. Replace battery on Font Card
3. Power on printer
4. Send: ~JB
5. Card is now restored

Typical Symptoms

Before ~JB

• Battery indicator shows failed
• Card cannot store new fonts
• Existing fonts may be inaccessible

After ~JB

• Battery indicator clears
• Card fully functional
• Ready for font storage

Related Commands

• ~DT - Download TrueType Font
• ~DS - Download Scalable Font
• ^JB - Initialize Flash Memory
• ~WC - Print Configuration Label

See Also

• Print Configuration Label (~WC)
• Download TrueType Font (~DT)